Hoist line hook



Aug: 31, 1937.

H. E. GRAU 2,091,477

HOIST LINE HOOK Filed May 6, 1956 Herbekf E. Gmu

INVENTOR.

A TTORNEYS.

Patented Aug. 31, 1937 ma n? carer oFFIcE HOIST LINE HOOK Herbert E. Grau, Huntington Park, Califi, as-

signor to Byron Jackson 00., Huntington Park, Calif., a corporation of Delaware Application May 6, 1936, Serial No. 78,186

3 Claims.

This invention relates to hoist line hooks such as are employed for raising and lowering drill pipe tubing or casing in an oil well. More particularly, the invention relates to improvements in that type of. hook which is provided with a safety latch for closing the entrance to the hook. One such type of drill pipe and casing is illustrated in U. S. Patent No. 1,825,018 issued September 29, 1931 to Nelson K. Smith. Two

10 such types of tubing hooks are illustrated in U.

S. Patent No. 2,027,376, issued January 1 1, 1936 to Herbert E. Grau.

Hoist line hooks for oil well service as constructed heretofore are provided with a downwardly and inwardly (toward the vertical axis of the hook shank) bail-receiving notch, a pivoted arm for closing the entrance to the notch and a releasable lock for the closing arm. The closing arm, when in the closed position, extends upwardly and inwardly toward the shank axis so that the upper end of the closing arm is above the bail in the notch. If the hook should be subjected to a violent jar in a vertical direction, such as might occur if the drilling line should break, the bail will spring upwardly and strike the ciosing arm a sharp blow which might be suificient to break the locking mechanism. It is obvious that space limitations will not permit the lock to be made large enough to withstand the most violent blows.

It is the object of the present invention to provide guard means for preventing the bail from striking the closing arm more than a glancing blow which would be insufficient to cause damage.

In the drawing:

Figure 1 is a vertical side elevation, partly in cross section, taken on line BB of Figure 2, showing a safety hook provided with my novel guard means.

Figure 2 is a vertical front elevation, partly in cross section, taken on line AA of Figure 1.

Inasmuch as my invention is concerned only with the bail-receiving portion of the hook and has nothing to do with the swivelling mechanism or supporting becket I have shown only the lower portion of a hook in the drawing. The hook body is designated at l and is, in the present instance, (though not necessarily), supported from a cross pin 3 secured to a shank 5. The hook body is provided with a forwardly extending bill 1 forming a bail-receiving notch 9. A bail is indicated in the notch as shown at l l. A notch closing arm 13 is pivotally connected to the end of bill I by means of a pin l5. The closing arm I3 is adapted, when in the closed position, to extend upwardly and somewhat inwardly toward the shank axis so as to close the entrance to the bailreceiving notch 9. The upper end or head it of the closing arm I3 is, in the present instance, adapted to engage a lug l4 formed on the body 5 so as to carry a part of the load. The closing arm is also provided with latching means for locking the arm in the closed position. In the present instance the latch comprises a vertically slidable latch bolt i'l supported on a coil compression spring H3. The closing arm i3 is provided with an inwardly extending finger !8 adapted to be engaged by the bail ii to insure that the closing arm will be fully closed and locked when under load. The latch and lock construction shown herein are merely illustrative of one form of latch which may be used with hooks of the type in question.

In order to prevent the bail H from striking the closing arm l3 a direct blow suificient to break the latch H I provide a bumper recess M in the under side of the hook body at the top of the bail-receiving notch 9. The bumper recess 2! is positioned substantially directly above the bottom of the bail-receiving notch 9 and in line with the vertical axis of the hook shank. The bumper recess 2! is preferably concave, being curved in the plane shown in Figure 2 to conform approximately to the curvature of the bight of the bail l l, and being curved as shown in Figure 1 to conform substantially to the top of the bail as shown in the plane of Figure 1. The forward end of the bumper recess is preferably extended downwardly a substantial distance, sufficient to form. an overhanging guard or abutment 23 which will tend to force the bail back into the recess 2! away from the closing arm I3.

In hoist line hooks for oil well use the bailreceiving notch 53 is made as small as possible, being not substantially larger than the bail or bails normally received therein. I form the bumper recess 2i as substantially a complement to the size and shape of the lower portion of the bail-receiving notch 9 so that the bail or bails will be received wholly within the recess 2| in the event of an upward jar.

I claim:

1. In a hoist line hook having a body with a forwardly extending bill forming a bail-receiving notch extending inwardly and downwardly toward the vertical axis of the hook, latch means adapted to close the entrance to said bail-receiving notch, said hook body having a concave bumper recess formed in its under side adjacent the top of said bail-receiving notch and substantially in line with the vertical axis of the hook, said bumper recess being curved to conform substantially to the shape of the bight of a bail.

2. In a hoist line safety hook having a body with a forwardly extending bill forming a bailreceiving notch extending inwardly and downwardly toward the vertical axis of. the hook, an arm pivotally mounted on said hook body and adapted to close the entrance to said bail-receivin'g notch, a latch for releasably securing said arm in the closed position, said hook body having a concave bumper recess formed in its under side adjacent the top of said bail-receiving notch and substantially in line with the vertical axis of the hook, said bumper recess being curved to conform substantially to the shape of the bight of a bail.

3. In a hoist line safety hook having a body with a forwardly extending bill forming a bailreceiving notch extending inwardly and downwardly toward the vertical axis of the hook, an arm pivotally mounted on said body and adapted. to close the entrance to said bail-receiving notch, a latch for releasably securing said arm in the closed position, said hook body having a bumper recess formed in its under side adjacent the top of said bail-receiving notch and substantially in line with the vertical axis of the hook, said bumper recess having its forward Wall extending outwardly and downwardly away from the axis of. the hook a distance sufiicient to form a deflecting guard wall for a bail, and being forward of the position normally occupied by a bail.

HERBERT E. GRAU. 

